A GEOPHYSICAL-STUDY OF THE GRANITES AND THE SEDIMENTARY BASINS OF THEXANTHI AREA (NORTHERN GREECE)

Intrusive features of varying size can be interpreted from the aeromag netic map of the Xanthi area in N. Greece. The Xanthi pluton, which ou tcrops north of the city of Xanthi, seems to have the shape of a trunc ated pyramid. This feature has relatively large areal extent and reach es an approximate depth of 7 km. Another, relatively large magnetic bo dy is buried under the sediments at the estuary of the Nestos River. 3 -D models of several smaller intrusions were constructed and the produ ced effect was compared to the observed. Some of these intrusions seem to be detached branches of the large Xanthi pluton. The basement in t he outer part of the basin of the Nestos River seems to be buried at a bout 4 km depth. This figure is obtained by the ''Multiple Source Wern er Deconvolution'' estimates and it is in agreement with the results o f former geophysical studies and deep industrial boreholes. A 3-D mode l of the Xanthi-Komotini basin suggests that this basin is about 0.4 k m deep at its southern part. The depth at its northern boundary is abo ut 1.8 km while the boundary itself is formed by the large Kavala-Xant hi-Komotini fault. The Tertiary basin of the Nestos River and the obse rved magmatism are consistent with the idea of an older extensional te ctonic regime in the area.